The full moon of Saturday May 21, 2016 rises over the Blue Moon drive-in movie theater on Highway 43 in Gu-Win, Ala. The full moon is the third in a season of four full moons and is called a "blue moon."(Michael E. Palmer/Palmer's Almanac)

Every now and again four full moons will appear in a single season. Normally, three full moons appear in each three-month season- Summer, Autumn, Winter and Spring- and that equals 12 full moons in a year. In spring 2016, there are four full moons, occurring on March 23, April 22, May 21 and June 20. Ancient calendar keepers called the third full moon of four in a season a "belewe" moon, an Old English term that meant betrayer. And thus "belewe" evolved linguistically to became the "blue" which we use today. To read more about that, click here. Below is a gallery of photos of the "blue moon" over the Blue Moon drive-in movie theater located in Gu-Win, Alabama. Enjoy.​